In my opinion, the biggest reason to promote something along these lines is: it can allow someone to pop in and *quickly and easily* see who needs help on what. That is, I'm (often) more interested in the unresolved questions than the ones that have been beaten to death. When I've got a lot of time, I'll sift through more stuff... but sometimes you just want to pop in (or push), see if there's anything that's not being answered, and pop out.